OCH3 Na осн, CHз Он 1) NaH (sodium hydride) 2) CH3I 2

(4) Provide the reagents necessary to carry out the following synthesis. + enantiomer (A) (1) (i) BH3, (ii) H₂O2, NaOH; (2) NaOEt JATOT (B) (1) (i) BH3, (ii) H₂O2, NaOH; (2) TsCl, pyridine; (3) KOC(CH3)3 (C) (1) H3O+, (2) TsCl, pyridine, (3) KOC(CH3)3 (D) (1) HBr (no peroxides); (2) NaOEt

Please don't provide handwritten solution...

3) Provide the major organic product of the reaction shown below. (CH3)3 CCH2Cl, AICI3

For EACH of the following reactions (a)-(d) provide a curved arrow mechanism and where appropriate briefly comment on any issues of selectivity that arise. (a) (b) (c) CHO MeO OMe 3 OH MeO NH OEt Me (i) Ph3P=CBr2 (ii) "BuLi (2 equivs) (iii) Mel + H₂SO4 (cat) OMe H₂O Me3Si * TfO OMe O MeCN CO₂Me MeO CsF, NaHCO3 Me COMe OMe

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A reasonable synthesis for each of the following compounds

Give detailed Solution with explanation needed

This reaction is also an important reaction of the tricarboxylic acid cycle in cells, wherein the reaction occurs in neutral solution, so the acid groups are both ionized to the carboxylate form. The reaction is catalyzed by the stereospecific enzyme fumarase that utilizes only the trans form of 2-butenedioate ion (also known as fumarate) and produces only the (S)-2-hydroxysuccinate enantiomer (also known as (S)-malate). Draw the correct stereochemical structures of these two compounds of the fumarase-catalyzed reaction. Be sure to include all hydrogen atoms and show the carboxylates as anions.